I traveled back from the Nether and got the following:

02:22:42] [Server thread/WARN] [FML]: Binnie Core loaded a new chunk (4, -31 Dimension: -1) during chunk population, causing cascading worldgen lag. Please report this to the mod's issue tracker. This log can be disabled in the Forge config.

this is not an issue, basicly it says it did set a beehive/tree on -4 -31 in the nether.
you can disable logging in forge.cfg
# Log cascading chunk generation issues during terrain population. B:logCascadingWorldGeneration=false

duplicate #315?